CA2616540A1 - Method of removing mercury from combustion exhaust gases - Google Patents

Method of removing mercury from combustion exhaust gases Download PDF

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Publication number
CA2616540A1
CA2616540A1 CA002616540A CA2616540A CA2616540A1 CA 2616540 A1 CA2616540 A1 CA 2616540A1 CA 002616540 A CA002616540 A CA 002616540A CA 2616540 A CA2616540 A CA 2616540A CA 2616540 A1 CA2616540 A1 CA 2616540A1
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CA
Canada
Prior art keywords
solution
exhaust gases
combustion exhaust
mercury
adsorption agent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002616540A
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French (fr)
Other versions
CA2616540C (en
Inventor
Hermann Winkler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Steag Energy Services GmbH
Original Assignee
Evonik Energy Services GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Evonik Energy Services GmbH filed Critical Evonik Energy Services GmbH
Publication of CA2616540A1 publication Critical patent/CA2616540A1/en
Application granted granted Critical
Publication of CA2616540C publication Critical patent/CA2616540C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/64—Heavy metals or compounds thereof, e.g. mercury
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/102—Carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/60—Heavy metals or heavy metal compounds
    • B01D2257/602—Mercury or mercury compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/40—Further details for adsorption processes and devices
    • B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Analytical Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Treating Waste Gases (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Treatment Of Water By Ion Exchange (AREA)
  • Removal Of Specific Substances (AREA)
  • Water Treatment By Sorption (AREA)

Abstract

The present invention relates to a method of removing mercury from combustion exhaust gases from combustion plants, such as power stations or waste combustion plants. Previous methods for removing mercury from combustion exhaust gases are structurally complex and cost intensive. The object resulting from this problem is solved by a method, in which the mercury-containing combustion exhaust gases are brought into contact with an adsorption agent, whereby the mercury is substantially adsorbed by the adsorption agent during this contact. After the adsorption has occurred the adsorption agent is separated from the combustion exhaust gases and added to an aqueous solution containing an oxidising agent, whereby the adsorbed mercury goes into solution as Hg2+. The Hg2+-containing solution is subsequently separated from the adsorption agent and the Hg2+ is then removed from the solution. This conduct of the method enables the mercury to be removed from the combustion exhaust gases in a simple and economical manner.

Claims (10)

1. Method of removing mercury from combustion exhaust gases including the following steps:
a) bringing mercury contained in the combustion exhaust gases into contact with an adsorption agent, whereby the mercury is substantially adsorbed by the adsorption agent, b) separating the adsorption agent from the combustion exhaust gases, c) bringing the adsorption agent into contact with an aqueous solution containing an oxidising agent, whereby the adsorbed mercury goes into solution in the form of Hg2+, d) separating the Hg2+-containing solution from the adsorption agent, and e) removing the Hg2+ from the solution.
2. A method as claimed in claim 1, characterised in that the Hg2+ is removed from the solution by mixing the Hg2+-containing solution with a precipitating agent, which forms with the Hg2+ a low solubility precipitate and separating the latter from the solution.
3. A method as claimed in claim 2, characterised in that an organosulphide is used as the precipitating agent.
4. A method as claimed in claim 1, characterised in that the Hg2+ is removed from the solution by bringing the solution into contact with an ion exchanger.
5. A method as claimed in one of claims 1 to 4, characterised in that the Hg0 contained in the combustion gases is oxidised before bringing mercury contained in the combustion exhaust gases into contact with the adsorption agent.
6. As method as claimed in one of claims 1 to 5, characterised in that the adsorption agent is added to the combustion exhaust gases before or in an exhaust gas desulphurisation device.
7. A method as claimed in claim 6, characterised in that solid materials produced in the exhaust gas desulphurisation device are separated from the adsorption agent by centrifugal separation.
8. A method as claimed in one of claims 1 to 7, characterised in that hypochlorite, chlorine dioxide or chlorine gas is preferably used as the oxidising agent.
9. A method as claimed in one of claims 1 to 8, characterised in that activated carbon is used as the adsorption agent.
10. A method as claimed in one of claims 1 to 9, characterised in that after bringing it into contact with a solution containing an oxidising agent, the adsorption agent is separated and recirculated.
CA2616540A 2007-09-04 2007-12-21 Method of removing mercury from combustion exhaust gases Expired - Fee Related CA2616540C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP07115662A EP2033702B1 (en) 2007-09-04 2007-09-04 Method for removing mercury from exhaust combustion gases
EP07115662.4 2007-09-04

Publications (2)

Publication Number Publication Date
CA2616540A1 true CA2616540A1 (en) 2009-03-04
CA2616540C CA2616540C (en) 2012-04-17

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CA2616540A Expired - Fee Related CA2616540C (en) 2007-09-04 2007-12-21 Method of removing mercury from combustion exhaust gases

Country Status (15)

Country Link
US (1) US7727307B2 (en)
EP (1) EP2033702B1 (en)
JP (2) JP2009061450A (en)
KR (1) KR101124058B1 (en)
AT (1) ATE495812T1 (en)
AU (1) AU2008207555B2 (en)
CA (1) CA2616540C (en)
DE (1) DE502007006314D1 (en)
DK (1) DK2033702T3 (en)
ES (1) ES2359091T3 (en)
PL (1) PL2033702T3 (en)
PT (1) PT2033702E (en)
SI (1) SI2033702T1 (en)
TW (1) TWI355289B (en)
ZA (1) ZA200807352B (en)

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